ASIDE: As I type this, I just noticed that the R8 Bake component I used doesn’t have the extra ‘Bake’ input that yours does, only the ‘C’ (Content) input with the word “Update” appearing as a button. When I zoom in and click the “+” icon, I get the 'Bk" (Bake) input. Either way, results are the same. But if you use the 'Bk" (Bake) input, you must use a Boolean Toggle as you did, because Button is weird.
I created a “simple” GH file that creates a curved surface, centered at the origin. It then projects either a circle or polygon up to the surface and splits it, leaving a hole in the middle. Works flawlessly in R7.
In R8 (BETA), it first appears to work the same way, until I click the “Update” (Bake) button. The untrimmed surface is baked, without the hole 
Then it gets very weird - when I select the surface in Rhino, the construction plane tilts 
Oh wait, that happens only when I click the baked surface in Perspective view. No, wait… when I move the selected surface in Top view, the gumball tilts when I stop moving and then all views are messed up.
bake_srf_2023Sep25a.gh (17.0 KB)
